using Admin.NET.Plugin.AiDOP.Entity;
using Admin.NET.Plugin.AiDOP.Infrastructure;

namespace Admin.NET.Plugin.AiDOP.Controllers;

public partial class AidopKanbanController
{
    /// <summary>
    /// 智慧诊断：按模块和当前 L1 指标返回 L2/L3/L4 诊断矩阵。
    /// </summary>
    [HttpGet("smart-diagnosis/{moduleCode}")]
    public async Task<IActionResult> GetSmartDiagnosis(
        string moduleCode,
        [FromQuery] string? metricCode = null,
        [FromQuery] long factoryId = 1,
        [FromQuery] string? dateStart = null,
        [FromQuery] string? dateEnd = null,
        [FromQuery] string? product = null,
        [FromQuery] string? orderNo = null,
        [FromQuery] string? productionLine = null,
        [FromQuery] string? customer = null,
        [FromQuery] string? supplier = null,
        [FromQuery] string? material = null,
        [FromQuery] string? poNo = null,
        [FromQuery] string? warehouse = null,
        [FromQuery] string? workOrder = null,
        [FromQuery] string? equipment = null,
        [FromQuery] string? outboundNo = null)
    {
        var requested = (moduleCode ?? "").Trim().ToUpperInvariant();
        if (requested == "S8")
            return await GetSmartDiagnosisFromS8ExceptionsAsync(factoryId, dateStart, dateEnd, orderNo);

        var mc = NormalizeDynamicDashboardModule(moduleCode);
        if (mc == null) return BadRequest(new { message = "moduleCode 仅支持 S1/S2/S3/S4/S5/S6/S7/S8/S9" });

        var scope = await _trustedScope.ResolveAsync(factoryId);
        var tenantId = scope.TenantId;
        factoryId = scope.FactoryId;
        var filter = ParseDashboardFilter(
            dateStart, dateEnd, product, orderNo, productionLine,
            customer, supplier, material, poNo, warehouse, workOrder, equipment, outboundNo);
        var kpis = await _db.Queryable<AdoSmartOpsKpiMaster>()
            .Where(x => x.TenantId == tenantId && x.ModuleCode == mc && x.IsEnabled)
            .OrderBy(x => x.MetricLevel)
            .OrderBy(x => x.SortNo)
            .ToListAsync();
        var valueBundle = await ResolveDashboardValuesBundleAsync(tenantId, factoryId, mc, filter, kpis);
        var values = valueBundle.Values;
        var snaps = values.ToDictionary(
            x => x.Key,
            x => new SmartDiagnosisTree.ValueSnap(x.Value.MetricValue, x.Value.TargetValue),
            StringComparer.OrdinalIgnoreCase);
        var l1Metrics = kpis.Where(x => x.MetricLevel == 1).OrderBy(x => x.SortNo).ToList();
        var resolved = SmartDiagnosisTree.ResolveRoot(l1Metrics, snaps, metricCode);
        if (resolved.Error != null)
            return BadRequest(new { message = resolved.Error });
        var root = resolved.Root;
        if (root == null)
            return Ok(new { moduleCode = mc, metricCode, title = $"{mc} 智慧诊断", stages = Array.Empty<object>(), hasChildren = false });

        var children = SmartDiagnosisTree.DirectChildren(kpis, root.Id, 2);
        var stagePayload = children.Select((kpi, index) =>
        {
            var current = BuildDiagnosisValue(kpi, values);
            var l3Rows = SmartDiagnosisTree.DirectChildren(kpis, kpi.Id, 3);
            var l4Rows = l3Rows.ToDictionary(
                x => x.MetricCode,
                x => SmartDiagnosisTree.DirectChildren(kpis, x.Id, 4)
                    .Select(y => BuildDiagnosisNode(y, values))
                    .ToList(),
                StringComparer.OrdinalIgnoreCase);
            return new
            {
                key = kpi.MetricCode,
                name = kpi.MetricName,
                flowCaption = kpi.MetricName,
                dept = string.IsNullOrWhiteSpace(kpi.Department) ? "未配置" : kpi.Department,
                kpi = FormatDiagnosisValue(current.Target, kpi.Unit),
                actualDays = FormatDiagnosisValue(current.Current, kpi.Unit),
                actualRate = SmartDiagnosisTree.BuildDiagnosisRate(current.Current, current.Target, kpi.Direction),
                status = current.Status,
                callout = BuildDiagnosisCallout(kpi.MetricName, current.Status, current.GapLabel),
                calloutTone = current.Status,
                sortNo = kpi.SortNo > 0 ? kpi.SortNo : index + 1,
                tier1 = l3Rows.Select(x => BuildDiagnosisNode(x, values)).ToList(),
                tier2 = l4Rows
            };
        }).ToList();

        var rootValue = BuildDiagnosisValue(root, values);
        var worstStage = stagePayload
            .OrderByDescending(x => SmartDiagnosisTree.DiagnosisSeverity(x.status))
            .ThenBy(x => x.sortNo)
            .FirstOrDefault();
        var selectionLabel = resolved.SelectionMode == SmartDiagnosisTree.SelectionGlobalWorst
            ? $"全局自动选择：{root.MetricName}"
            : $"当前指标：{root.MetricName}";

        var evidence = await _evidence.QueryAsync(tenantId, factoryId, mc, filter);
        return Ok(new
        {
            moduleCode = mc,
            metricCode = root.MetricCode,
            metricName = root.MetricName,
            title = $"{mc} {ResolveDashboardModuleName(mc)} · 智慧诊断",
            subtitle = selectionLabel,
            selectionMode = resolved.SelectionMode,
            hasChildren = children.Count > 0,
            dataSource = BuildDataSourcePayload(valueBundle),
            evidence,
            root = new
            {
                metricCode = root.MetricCode,
                metricName = root.MetricName,
                currentValue = rootValue.Current,
                targetValue = rootValue.Target,
                unit = root.Unit ?? "",
                status = rootValue.Status,
                gapLabel = rootValue.GapLabel,
                department = string.IsNullOrWhiteSpace(root.Department) ? "未配置" : root.Department
            },
            pmSummary = new
            {
                node = worstStage?.name ?? root.MetricName,
                leadDelta = rootValue.GapLabel ?? "0"
            },
            stages = stagePayload
        });
    }

    private async Task<IActionResult> GetSmartDiagnosisFromS8ExceptionsAsync(
        long factoryId,
        string? dateStart,
        string? dateEnd,
        string? orderNo)
    {
        var scope = await _trustedScope.ResolveAsync(factoryId);
        var filter = ParseDashboardFilter(
            dateStart, dateEnd, null, orderNo, null,
            null, null, null, null, null, null, null, null);
        var evidence = await _evidence.QueryAsync(scope.TenantId, scope.FactoryId, "S8", filter);
        var first = evidence.Items.FirstOrDefault();
        return Ok(new
        {
            moduleCode = "S8",
            metricCode = first == null ? null : "S8_EXCEPTION",
            metricName = first?.Title,
            title = "S8 异常监控 · 智慧诊断",
            subtitle = first == null ? "无可用 S8 异常佐证" : $"依据已存在异常：{first.ObjectCode}",
            selectionMode = "s8_exception",
            hasChildren = false,
            evidence,
            root = first == null ? null : new
            {
                metricCode = "S8_EXCEPTION",
                metricName = first.Title,
                currentValue = first.Contribution,
                targetValue = (decimal?)null,
                unit = "",
                status = first.Status,
                gapLabel = first.ObjectCode,
                department = "异常监控"
            },
            stages = Array.Empty<object>()
        });
    }

    private static object BuildDiagnosisNode(AdoSmartOpsKpiMaster kpi, Dictionary<string, DashboardMetricValueModel> values)
    {
        var v = BuildDiagnosisValue(kpi, values);
        return new
        {
            key = kpi.MetricCode,
            name = kpi.MetricName,
            plan = FormatDiagnosisValue(v.Target, kpi.Unit),
            actual = FormatDiagnosisValue(v.Current, kpi.Unit),
            status = v.Status,
            dept = string.IsNullOrWhiteSpace(kpi.Department) ? "未配置" : kpi.Department
        };
    }

    private static DiagnosisValue BuildDiagnosisValue(AdoSmartOpsKpiMaster kpi, Dictionary<string, DashboardMetricValueModel> values)
    {
        values.TryGetValue(kpi.MetricCode, out var value);
        var status = AidopS4KpiMerge.AchievementLevel(
            value?.MetricValue,
            value?.TargetValue,
            kpi.Direction ?? "higher_is_better",
            kpi.YellowThreshold,
            kpi.RedThreshold);
        var gap = AidopS4KpiMerge.GapValue(value?.MetricValue, value?.TargetValue);
        return new DiagnosisValue(value?.MetricValue, value?.TargetValue, status, FormatGapLabelGeneric(gap, kpi.Unit));
    }

    private static string FormatDiagnosisValue(decimal? value, string? unit)
    {
        if (value == null) return "-";
        var rounded = decimal.Round(value.Value, 2);
        return $"{rounded:0.##}{unit ?? ""}";
    }

    private static string BuildDiagnosisCallout(string? metricName, string status, string? gapLabel)
    {
        var name = string.IsNullOrWhiteSpace(metricName) ? "当前指标" : metricName;
        return status switch
        {
            "red" => $"{name} 未达标，期量差 {gapLabel ?? "-"}，建议优先定位责任环节。",
            "yellow" => $"{name} 存在预警，期量差 {gapLabel ?? "-"}，建议持续跟踪。",
            "green" => $"{name} 达标，可作为后续环节输入。",
            _ => $"{name} 暂无完整诊断数据。"
        };
    }

    private sealed record DiagnosisValue(decimal? Current, decimal? Target, string Status, string? GapLabel);
}